You ain't heard a chorus like this in a long time

from Kendrick Lamar – Bitch, Don't Kill My Vibe Lyrics on Rap Genius

He’s saying the chorus harkens back to something you don’t hear too much in hip hop today, i.e. “in a long time.” It’s arguable why it’s different or how you might categorize it or compare it to today’s rap, but to me it’s got a subtle g-funk influenced sung aspect to it, where a lot of today’s rap choruses and hooks are dominated by the hoops and hollers and chants that southern hip hop and ringtone rap started.

It’s been a long time since rappers have put
“bible references” in a catchy chorus. He took a risk that not too many people in rap would even dare to do.

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